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Economics and Mathematics

http://catalog.yale.edu/ycps/subjects-of-instruction/economics-mathematics/

...2021, ECON 121 may no longer be substituted for ECON 125 and ECON 122 may...

Economics

http://catalog.yale.edu/ycps/subjects-of-instruction/economics/

...level courses ( ECON 121 or ECON 125 for microeconomics, ECON 122 or ECON 126 for...

Economics

http://catalog.yale.edu/first-year-student-handbook/academic-information/programs-study/economics/

...level courses ( ECON 121 or ECON 125 for microeconomics, ECON 122 or ECON 126 for...